System and method for improving driveline operation
AssigneeFord Global Technologies, LLC
InventorsAlexander O'Connor Gibson, Matthew John Shelton, Kirk Pebley, Hong Jiang, Felix Nedorezov
Life of this patent
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Abstract
Methods and systems for improving operation of a vehicle driveline that includes an engine and a driveline disconnect clutch that selectively couples the engine to a torque converter are presented. In one non-limiting example, a torque converter clutch is closed before the driveline disconnect clutch is opened so that output of a transmission pump may be maintained and so that torque converter impeller speed may be determined.
Claims20
A method for operating a driveline, comprising:
- at least partially closing a torque converter clutch in response to a request to open a disconnect clutch, the torque converter clutch at least partially closed before opening the disconnect clutch;
- and
- accelerating an engine that has stopped rotating to a speed based on disconnect clutch output side speed.
A method for operating a driveline, comprising:
- not opening a disconnect clutch in response to a request to open the disconnect clutch until a torque converter clutch has at least partially closed to provide more than a threshold amount of torque transfer capacity across the torque converter clutch.
A vehicle system, comprising:
- an engine;
- a transmission including a torque converter having a torque converter clutch;
- a disconnect clutch positioned between the engine and the torque converter;
- and
- a controller including instructions stored in a non-transitory memory for accelerating the engine to a speed of an output side of the disconnect clutch when the disconnect clutch is open, the speed of the output side of the disconnect clutch determined based on a transmission shaft input speed.
Dependencies are inferred from the claim text.